Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "pack.h"
   3#include "refs.h"
   4#include "pkt-line.h"
   5#include "run-command.h"
   6#include "exec_cmd.h"
   7#include "commit.h"
   8#include "object.h"
   9
  10static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
  11
  12static int deny_non_fast_forwards = 0;
  13static int receive_unpack_limit = -1;
  14static int transfer_unpack_limit = -1;
  15static int unpack_limit = 100;
  16static int report_status;
  17
  18static char capabilities[] = " report-status delete-refs ";
  19static int capabilities_sent;
  20
  21static int receive_pack_config(const char *var, const char *value)
  22{
  23        if (strcmp(var, "receive.denynonfastforwards") == 0) {
  24                deny_non_fast_forwards = git_config_bool(var, value);
  25                return 0;
  26        }
  27
  28        if (strcmp(var, "receive.unpacklimit") == 0) {
  29                receive_unpack_limit = git_config_int(var, value);
  30                return 0;
  31        }
  32
  33        if (strcmp(var, "transfer.unpacklimit") == 0) {
  34                transfer_unpack_limit = git_config_int(var, value);
  35                return 0;
  36        }
  37
  38        return git_default_config(var, value);
  39}
  40
  41static int show_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
  42{
  43        if (capabilities_sent)
  44                packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
  45        else
  46                packet_write(1, "%s %s%c%s\n",
  47                             sha1_to_hex(sha1), path, 0, capabilities);
  48        capabilities_sent = 1;
  49        return 0;
  50}
  51
  52static void write_head_info(void)
  53{
  54        for_each_ref(show_ref, NULL);
  55        if (!capabilities_sent)
  56                show_ref("capabilities^{}", null_sha1, 0, NULL);
  57
  58}
  59
  60struct command {
  61        struct command *next;
  62        const char *error_string;
  63        unsigned char old_sha1[20];
  64        unsigned char new_sha1[20];
  65        char ref_name[FLEX_ARRAY]; /* more */
  66};
  67
  68static struct command *commands;
  69
  70static const char update_hook[] = "hooks/update";
  71
  72static int run_hook(const char *hook_name,
  73        struct command *first_cmd,
  74        int single)
  75{
  76        struct command *cmd;
  77        int argc, code;
  78        const char **argv;
  79
  80        for (argc = 0, cmd = first_cmd; cmd; cmd = cmd->next) {
  81                if (!cmd->error_string)
  82                        argc += 3;
  83                if (single)
  84                        break;
  85        }
  86
  87        if (!argc || access(hook_name, X_OK) < 0)
  88                return 0;
  89
  90        argv = xmalloc(sizeof(*argv) * (2 + argc));
  91        argv[0] = hook_name;
  92        for (argc = 1, cmd = first_cmd; cmd; cmd = cmd->next) {
  93                if (!cmd->error_string) {
  94                        argv[argc++] = xstrdup(cmd->ref_name);
  95                        argv[argc++] = xstrdup(sha1_to_hex(cmd->old_sha1));
  96                        argv[argc++] = xstrdup(sha1_to_hex(cmd->new_sha1));
  97                }
  98                if (single)
  99                        break;
 100        }
 101        argv[argc] = NULL;
 102
 103        code = run_command_v_opt(argv,
 104                RUN_COMMAND_NO_STDIN | RUN_COMMAND_STDOUT_TO_STDERR);
 105        while (--argc > 0)
 106                free((char*)argv[argc]);
 107        free(argv);
 108
 109        switch (code) {
 110        case 0:
 111                return 0;
 112        case -ERR_RUN_COMMAND_FORK:
 113                return error("hook fork failed");
 114        case -ERR_RUN_COMMAND_EXEC:
 115                return error("hook execute failed");
 116        case -ERR_RUN_COMMAND_WAITPID:
 117                return error("waitpid failed");
 118        case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 119                return error("waitpid is confused");
 120        case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 121                return error("%s died of signal", hook_name);
 122        case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 123                return error("%s died strangely", hook_name);
 124        default:
 125                error("%s exited with error code %d", hook_name, -code);
 126                return -code;
 127        }
 128}
 129
 130static int update(struct command *cmd)
 131{
 132        const char *name = cmd->ref_name;
 133        unsigned char *old_sha1 = cmd->old_sha1;
 134        unsigned char *new_sha1 = cmd->new_sha1;
 135        struct ref_lock *lock;
 136
 137        cmd->error_string = NULL;
 138        if (!prefixcmp(name, "refs/") && check_ref_format(name + 5)) {
 139                cmd->error_string = "funny refname";
 140                return error("refusing to create funny ref '%s' locally",
 141                             name);
 142        }
 143
 144        if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
 145                cmd->error_string = "bad pack";
 146                return error("unpack should have generated %s, "
 147                             "but I can't find it!", sha1_to_hex(new_sha1));
 148        }
 149        if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
 150            !is_null_sha1(old_sha1) &&
 151            !prefixcmp(name, "refs/heads/")) {
 152                struct commit *old_commit, *new_commit;
 153                struct commit_list *bases, *ent;
 154
 155                old_commit = (struct commit *)parse_object(old_sha1);
 156                new_commit = (struct commit *)parse_object(new_sha1);
 157                bases = get_merge_bases(old_commit, new_commit, 1);
 158                for (ent = bases; ent; ent = ent->next)
 159                        if (!hashcmp(old_sha1, ent->item->object.sha1))
 160                                break;
 161                free_commit_list(bases);
 162                if (!ent)
 163                        return error("denying non-fast forward;"
 164                                     " you should pull first");
 165        }
 166        if (run_hook(update_hook, cmd, 1)) {
 167                cmd->error_string = "hook declined";
 168                return error("hook declined to update %s", name);
 169        }
 170
 171        if (is_null_sha1(new_sha1)) {
 172                if (delete_ref(name, old_sha1)) {
 173                        cmd->error_string = "failed to delete";
 174                        return error("failed to delete %s", name);
 175                }
 176                fprintf(stderr, "%s: %s -> deleted\n", name,
 177                        sha1_to_hex(old_sha1));
 178        }
 179        else {
 180                lock = lock_any_ref_for_update(name, old_sha1);
 181                if (!lock) {
 182                        cmd->error_string = "failed to lock";
 183                        return error("failed to lock %s", name);
 184                }
 185                if (write_ref_sha1(lock, new_sha1, "push")) {
 186                        cmd->error_string = "failed to write";
 187                        return -1; /* error() already called */
 188                }
 189                fprintf(stderr, "%s: %s -> %s\n", name,
 190                        sha1_to_hex(old_sha1), sha1_to_hex(new_sha1));
 191        }
 192        return 0;
 193}
 194
 195static char update_post_hook[] = "hooks/post-update";
 196
 197static void run_update_post_hook(struct command *cmd)
 198{
 199        struct command *cmd_p;
 200        int argc;
 201        const char **argv;
 202
 203        for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
 204                if (cmd_p->error_string)
 205                        continue;
 206                argc++;
 207        }
 208        if (!argc || access(update_post_hook, X_OK) < 0)
 209                return;
 210        argv = xmalloc(sizeof(*argv) * (2 + argc));
 211        argv[0] = update_post_hook;
 212
 213        for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
 214                char *p;
 215                if (cmd_p->error_string)
 216                        continue;
 217                p = xmalloc(strlen(cmd_p->ref_name) + 1);
 218                strcpy(p, cmd_p->ref_name);
 219                argv[argc] = p;
 220                argc++;
 221        }
 222        argv[argc] = NULL;
 223        run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
 224                | RUN_COMMAND_STDOUT_TO_STDERR);
 225}
 226
 227/*
 228 * This gets called after(if) we've successfully
 229 * unpacked the data payload.
 230 */
 231static void execute_commands(void)
 232{
 233        struct command *cmd = commands;
 234        while (cmd) {
 235                update(cmd);
 236                cmd = cmd->next;
 237        }
 238}
 239
 240static void read_head_info(void)
 241{
 242        struct command **p = &commands;
 243        for (;;) {
 244                static char line[1000];
 245                unsigned char old_sha1[20], new_sha1[20];
 246                struct command *cmd;
 247                char *refname;
 248                int len, reflen;
 249
 250                len = packet_read_line(0, line, sizeof(line));
 251                if (!len)
 252                        break;
 253                if (line[len-1] == '\n')
 254                        line[--len] = 0;
 255                if (len < 83 ||
 256                    line[40] != ' ' ||
 257                    line[81] != ' ' ||
 258                    get_sha1_hex(line, old_sha1) ||
 259                    get_sha1_hex(line + 41, new_sha1))
 260                        die("protocol error: expected old/new/ref, got '%s'",
 261                            line);
 262
 263                refname = line + 82;
 264                reflen = strlen(refname);
 265                if (reflen + 82 < len) {
 266                        if (strstr(refname + reflen + 1, "report-status"))
 267                                report_status = 1;
 268                }
 269                cmd = xmalloc(sizeof(struct command) + len - 80);
 270                hashcpy(cmd->old_sha1, old_sha1);
 271                hashcpy(cmd->new_sha1, new_sha1);
 272                memcpy(cmd->ref_name, line + 82, len - 81);
 273                cmd->error_string = "n/a (unpacker error)";
 274                cmd->next = NULL;
 275                *p = cmd;
 276                p = &cmd->next;
 277        }
 278}
 279
 280static const char *parse_pack_header(struct pack_header *hdr)
 281{
 282        switch (read_pack_header(0, hdr)) {
 283        case PH_ERROR_EOF:
 284                return "eof before pack header was fully read";
 285
 286        case PH_ERROR_PACK_SIGNATURE:
 287                return "protocol error (pack signature mismatch detected)";
 288
 289        case PH_ERROR_PROTOCOL:
 290                return "protocol error (pack version unsupported)";
 291
 292        default:
 293                return "unknown error in parse_pack_header";
 294
 295        case 0:
 296                return NULL;
 297        }
 298}
 299
 300static const char *pack_lockfile;
 301
 302static const char *unpack(void)
 303{
 304        struct pack_header hdr;
 305        const char *hdr_err;
 306        char hdr_arg[38];
 307
 308        hdr_err = parse_pack_header(&hdr);
 309        if (hdr_err)
 310                return hdr_err;
 311        snprintf(hdr_arg, sizeof(hdr_arg), "--pack_header=%u,%u",
 312                        ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
 313
 314        if (ntohl(hdr.hdr_entries) < unpack_limit) {
 315                int code;
 316                const char *unpacker[3];
 317                unpacker[0] = "unpack-objects";
 318                unpacker[1] = hdr_arg;
 319                unpacker[2] = NULL;
 320                code = run_command_v_opt(unpacker, RUN_GIT_CMD);
 321                switch (code) {
 322                case 0:
 323                        return NULL;
 324                case -ERR_RUN_COMMAND_FORK:
 325                        return "unpack fork failed";
 326                case -ERR_RUN_COMMAND_EXEC:
 327                        return "unpack execute failed";
 328                case -ERR_RUN_COMMAND_WAITPID:
 329                        return "waitpid failed";
 330                case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 331                        return "waitpid is confused";
 332                case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 333                        return "unpacker died of signal";
 334                case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 335                        return "unpacker died strangely";
 336                default:
 337                        return "unpacker exited with error code";
 338                }
 339        } else {
 340                const char *keeper[6];
 341                int fd[2], s, len, status;
 342                pid_t pid;
 343                char keep_arg[256];
 344                char packname[46];
 345
 346                s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
 347                if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
 348                        strcpy(keep_arg + s, "localhost");
 349
 350                keeper[0] = "index-pack";
 351                keeper[1] = "--stdin";
 352                keeper[2] = "--fix-thin";
 353                keeper[3] = hdr_arg;
 354                keeper[4] = keep_arg;
 355                keeper[5] = NULL;
 356
 357                if (pipe(fd) < 0)
 358                        return "index-pack pipe failed";
 359                pid = fork();
 360                if (pid < 0)
 361                        return "index-pack fork failed";
 362                if (!pid) {
 363                        dup2(fd[1], 1);
 364                        close(fd[1]);
 365                        close(fd[0]);
 366                        execv_git_cmd(keeper);
 367                        die("execv of index-pack failed");
 368                }
 369                close(fd[1]);
 370
 371                /*
 372                 * The first thing we expects from index-pack's output
 373                 * is "pack\t%40s\n" or "keep\t%40s\n" (46 bytes) where
 374                 * %40s is the newly created pack SHA1 name.  In the "keep"
 375                 * case, we need it to remove the corresponding .keep file
 376                 * later on.  If we don't get that then tough luck with it.
 377                 */
 378                for (len = 0;
 379                     len < 46 && (s = xread(fd[0], packname+len, 46-len)) > 0;
 380                     len += s);
 381                close(fd[0]);
 382                if (len == 46 && packname[45] == '\n' &&
 383                    memcmp(packname, "keep\t", 5) == 0) {
 384                        char path[PATH_MAX];
 385                        packname[45] = 0;
 386                        snprintf(path, sizeof(path), "%s/pack/pack-%s.keep",
 387                                 get_object_directory(), packname + 5);
 388                        pack_lockfile = xstrdup(path);
 389                }
 390
 391                /* Then wrap our index-pack process. */
 392                while (waitpid(pid, &status, 0) < 0)
 393                        if (errno != EINTR)
 394                                return "waitpid failed";
 395                if (WIFEXITED(status)) {
 396                        int code = WEXITSTATUS(status);
 397                        if (code)
 398                                return "index-pack exited with error code";
 399                        reprepare_packed_git();
 400                        return NULL;
 401                }
 402                return "index-pack abnormal exit";
 403        }
 404}
 405
 406static void report(const char *unpack_status)
 407{
 408        struct command *cmd;
 409        packet_write(1, "unpack %s\n",
 410                     unpack_status ? unpack_status : "ok");
 411        for (cmd = commands; cmd; cmd = cmd->next) {
 412                if (!cmd->error_string)
 413                        packet_write(1, "ok %s\n",
 414                                     cmd->ref_name);
 415                else
 416                        packet_write(1, "ng %s %s\n",
 417                                     cmd->ref_name, cmd->error_string);
 418        }
 419        packet_flush(1);
 420}
 421
 422static int delete_only(struct command *cmd)
 423{
 424        while (cmd) {
 425                if (!is_null_sha1(cmd->new_sha1))
 426                        return 0;
 427                cmd = cmd->next;
 428        }
 429        return 1;
 430}
 431
 432int main(int argc, char **argv)
 433{
 434        int i;
 435        char *dir = NULL;
 436
 437        argv++;
 438        for (i = 1; i < argc; i++) {
 439                char *arg = *argv++;
 440
 441                if (*arg == '-') {
 442                        /* Do flag handling here */
 443                        usage(receive_pack_usage);
 444                }
 445                if (dir)
 446                        usage(receive_pack_usage);
 447                dir = arg;
 448        }
 449        if (!dir)
 450                usage(receive_pack_usage);
 451
 452        if (!enter_repo(dir, 0))
 453                die("'%s': unable to chdir or not a git archive", dir);
 454
 455        if (is_repository_shallow())
 456                die("attempt to push into a shallow repository");
 457
 458        git_config(receive_pack_config);
 459
 460        if (0 <= transfer_unpack_limit)
 461                unpack_limit = transfer_unpack_limit;
 462        else if (0 <= receive_unpack_limit)
 463                unpack_limit = receive_unpack_limit;
 464
 465        write_head_info();
 466
 467        /* EOF */
 468        packet_flush(1);
 469
 470        read_head_info();
 471        if (commands) {
 472                const char *unpack_status = NULL;
 473
 474                if (!delete_only(commands))
 475                        unpack_status = unpack();
 476                if (!unpack_status)
 477                        execute_commands();
 478                if (pack_lockfile)
 479                        unlink(pack_lockfile);
 480                if (report_status)
 481                        report(unpack_status);
 482                run_update_post_hook(commands);
 483        }
 484        return 0;
 485}